Air-pump



UNITED STATES PATENT OEEICE.

ALFRED H. ARMOR, OF CHICAGO, ILLINOIS.

AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. 258,347, dated May 23, 1882.

Application .filed Tune 30, 1881,n (No model.)

To all whom it may concern:

Be it known that I, "LFRED H. ARMOR, a citizen ofthe United tatcs, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Air-Pumps, of which the following is a specification.

My invention relates to improvements in airpumps; and it consists in the construction and arrangement ofparts, as hereinafter more fully described and claimed.

In the annexed drawings, Figure l is a sectional elevation of my improved air-pump. Fig. 2 is an enlarged section ofthe same, showing details of construction. Fig. 3 is a top view of the pump. Fig. 4 is a top view of the lower piston-plates. Fig. 5 is a cross-section ot' the plates, and Fig. 6 is a plan view of the upper piston-plate and hub.`

Similar letters referto similar parts throughout the several views.

A is a east-iron cylinder, having a detachable bottom, B, the outside of which is convex and the inside concave to correspond with the plate of the plunger. At the top of the cylinder is a ring, O, having a screw-thread, by means of which it is detachably secured thereto. This ring is provided with' arms I), which incline inwardly and upwardly and connect with a smaller screw-threaded ring, E, snrrounding the piston-rod, as shown in Figs. l, 2, and 3.

F is the cover of the cylinder, and is provided with a circular opening, having an inwardly-beveled edge for the reception of a smaller detachable cover, G, the edge of which is beveled to correspond with the outer annular cover. In the center ot' the cover G is an opening of suicient size to allow the pistonrod to work freely, and this cover is capable of being readily lifted, so as to allow the piston to be oiled without the usual necessity of withdrawing it from the cylinder. A packin g-ring, a, is-"placed between the cover F and upper end of the cylinder.

H is a tubular piston-rod, provided with a handle, I, and having on its outer side ascrewthread, b. This tubular piston-rod incloses a rod, c, which is held in place by means of a nut or collar, d, which is supported by a screwnut, e, on the lower end of the tubular rod H.

The rod e is smaller in diameter than the inside diameter of the tubular rod H, and extends upward therein for about half-way above the lower end of the latter. At the top of the rod c is a nut, f, which is nearly of the same diameter as the interior of the tubular rod H, for the purpose of keeping the rod and piston steady by preventing the rod c from moving laterally within the tube H. Near the lower end of the rod c, at the point where it enters the hubs of the piston-plates, is a nut, g, for the purpose of tightening the piston-plates together. The lower end of the rod o is screw threaded for attachment of the piston-plates.

The piston K is composed of the detachable plates h i. These plates are provided on their upper faces with radial strengtheningribs 7c and concentric hubs m a, the hub m of the upper plate, h, being of sufficient size to receive the hub n ot' the lower plate, i, as shown in Figs. 2 and 5. The inner or adjacent surfaces of the piston-plates hi are provided near their edges with rings or circular flanges o 0, which are beveled, as shown, so that the ring on the lower plate will t readily within the ring on the upper plate. On the outer 'sides of these rings are ledges, between which is placed the leather packing p, a rubber packing-ring, s, V being arranged to surround the same, and the Whole is securely held in place by tightening the nut g on the rod c, which forces the piston-plates together, a thin liat ring, t, being preferablyarranged, as shown in Fig. 5, for the packing to rest against. Owing to the arrangement of the pistou-plates and their hubs, the hub n on the lower plate can be made suficiently long to have a screw thread on its inside of such length as to ai'ord a long` hold for the screw-threaded end of the rod o. This is an important advantage, as a short screw-thread would not give a sufficient hold and would be liable to pull off.

L in Fig. 3 represents a vent consisting of a screw-threaded tube having a screw-cap, and is arranged near the bottom of the cylinderfor the purpose of permitting the entrance and escape of air.

M are nipples for the attachment of tubes, by means of which the pump is connected with vessels containing the liquids to be acted upon.

w @o are lugs on the bottom of the cylinder,

by means of which it may be screwed or otherwise fastened to a table or platform.

When the piston-plates are resting on the bottom of the cylinder, it' the handle I is turned the piston will be drawn up to the top of the cylinder, carrying the plates and creating a vacuum in the cylinder between the same, provided tbe vent L and nipples M are closed. If

. the nipples M are connected with closed \'es sels containing milk or other liquids to be acted upon, such contents will be purified by the passage of air and odors from said vessels into the interior of the cylinder. On cutting ott" the communication between the cylinder and Vessels and opening the vent L the air in .the

cylinder will be expelled therefrom upon the descentof the piston without being returned to the vessels. By connecting the pump with two vessels the contents of each may, if desired, be alternately compressed and exhausted.

1n order to tighten or loosen the pistonplates h z', the piston is drawn to the top ofthe cylinand nut e, of the rod c, provided with nuts d gf, substantially as shown and described.

2. The combination, with the ribbed and flanged plates h i, having concentric hubs mn, of the tubular screw-threaded piston-rod H, nut e, and rod c, having nuts dg f, substantially as shown and described.

ALFRED H. ARMoR.;

Witnesses:

.J. TAYLOR HAIR, FRANK JoHNsoN. 

